Bending machines



NOV. 15, 1955 H JR 2,723,701

BENDING MACHINES Filed Oct. 23, 1951 2 Sheets-Sheet l Fig-l 27 lg 22 1; 20' 25 INVENTOR:

agvkfl 210971; By (14 a? all ATTORNEYS.

NOV- 15, 1955 R. M. SHAW, JR

BENDING MACHINES 2 Sheets-Shem 2 Filed Oct. 23, 1951 INVENTOR; 5/?! a? @4 5 4 BY all L ATTORNEYS.

United States Patent 2 ,723,701 BENDING MACHINES Ralph M. Shaw, In, EdgewaterPark, N. 1., assignor to Pedrick'lool'andMachine 60., Philadelphia, Pa., a corporation of Pennsylvania Application- Oetober 23,- 19-51, Seni'alNo. 252,698

8 Claims. (Cl. 153-40) Myinven-tionrelatesgenerally tobending machines and more specificallytobending-machines for bending tubes, pipes, ba-rs and-thel-ike; The priinaryobjectof this inventionis to provide a structure to achieveformation of complex, irregular and multiple bends in tubes, pipes, bars and the like in one operation, wherein such bends may have variable radii, such as in ellipses, parabolas, and the like, as well as to form circular bends of different constant radii.

Another object of this invention is to effect the bending of tubes, pipes, bars and the like by means of rotatable dies and a rotating cam cooperating therewith.

Another object of this invention is to provide an improved and simplified apparatus for bending tubes, pipes, bars and the like which has all the advantages'of my invention disclosed in Patent No. 2,501,241, issued on March 21, 1950, and which can achieve and improve upon the versatility of bending taught therein without utilization of a pressure fluid cylinder.

Another object of this invention is to effect compound and multiple bending in one plane of tubes, pipes, bars and the like for use in tubular furniture.

Another object of this invention is to effect the bending of tubes, pipes, bars and the like without causing incidental deformation of the original cross-section.

Another object of this invention is to provide a pinch die bending machine which is simple in construction and operation.

Other objects and attendant advantages will appear from the following detailed description of the attached drawings, wherein:

Fig. 1 shows the top plan view of a bending machine conveniently embodying my invention.

Fig. 2 is a vertical cross-sectional View taken on line IIII of Fig. 1.

Figs. 3-5 are diagrammatic views in top plan showing successive stages of a typical bending operation carried out by the machine.

With more specific reference to these illustrations, the numeral designates the recessed work table of the machine which is sustained at a convenient height from the floor by a supporting sub structure and which rotatably supports bull gear 12. Extending vertically up through the center of table 10 and bull gear 12 is a stud 11 having its upper portion 27 of reduced diameter. Fulcrumed on stud 11 above bull gear 12 is an arm 13 having its distal end secured to bull gear 12 by passage of a removable pin 14 through said end and into said gear. Afiixed to the upper portion 27 of stud 11 is a gear 15 having peripherally-grooved die rolls 19 freely rotatably mounted on arcuately spaced upstanding studs. A second gear 16 designed to mesh with gear 15 is keyed to a stub shaft 17 having rotative bearing in a journal 18 which, in turn, is slidably mounted in arm 13. The gearing herein illustrated and described as gears 15 and 16 is exemplary; any type of gearing well known in the art may be utilized to achieve the desired result. Journal 18 is slidably adjustable relative to arm 13 and stud 11 by 2,723,701 Patented Nov. 15, 19.55

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means of threaded spindle 23. Keyed with gear 16to stub shaft 17' is a peripherally-grooved cam element 20 which, in the bending, to be explained, cooperates with. die rolls 19. Ifdesired, camelement. 20 may be secured directly to spur gear wheel 16, rather thanbeing keyedj to shaft 17. In addition to the dierolls 19, the gear 15 carries a clamp 21 for holding one end of the tube 22 which is to be bent.

The machine is powered by an. electric. motor M suitably supported in the sub structure- Motor M has its shaft connected, through a worm gear speed. reducer, to a. vertical shaft 28 to which is. keyedv a pinion 241- meshing with bull gear 12.

Inthe bending operation, tube 221 is. passed, as shown in Fig. 1, horizontally through the interval, between. the rolls 19 and the cam 20, and one end thereofis securedinthe clamp 21, whereupon motor M- is. started to drive. bull gear 12 counterclockwise about stud 11. Arml13, secured to bull. gear. 12 by pin. 14, will also rotate counterclockwise about stud 11. Since: journal. 18v is mounted in. arm. 1-3 and supports stub shaft 17 upon which gear 16 and cam 20 are mounted, said gear 16 and cam 20 will travel counterclockwise with arm 13 aboutstud 11. Gear 16 will mesh with and revolve with cam 20 about gear 15 as shown diagrammatically in Figs. 3-5. Gear 15 remains stationary throughout the operation. As bull gear 12 and gear 16 move through a quadrant, the lobe 25 of cam 20, by reaction with the rolls 19, produces bending of corresponding curvature in tube 22, as shown in Figs. 3 and 4. As bull gear 12 and gear 16 move through a second quadrant, the lobe 26 of cam 20, by reaction with rolls 19, produces further bending of corresponding curvature in tube 22, as shown in Fig. 5. Upon the end of a complete revolution of bull gear 12, gear 16 and cam 20 are returned to the starting position shown in Fig. 1 where the finished tube 22 is removed and another placed in position in contemplation of repeating the cycle.

Journal 18, stub shaft 17 and gear 16 are adjustable relative to arm 13 and stud 11 by rotation of threaded spindle 23. In this manner, gears 15 and 16 may be separated and removed respectively from the element 27 of stud 11 and from shaft 17 for the purpose of mounting thereon gears of varying sizes. Additionally, die rolls 19 and cam 20 are removably secured respectively to gear 15 and shaft 17 (or gear 16, as the case may be) and may be removed therefrom and replaced by substitute die rolls and cams for the purpose of forming configurations in tube 22 other than that shown.

While I have explained my invention in detail, it is to be understood that the apparatus herein shown and described is to be taken as typical embodiment of the same, and that various changes in the shape, size, assembly and arrangement of the parts may be resorted to without departing from the spirit of the invention or the scope of the claims.

Having thus described my invention, I claim:

1. In a machine for bending pipes, tubes, bars and the like, a pair of relatively rotating intermeshing gear wheels, one gear wheel having a plurality of arcuately spaced die rolls mounted thereon and the other gear wheel having a profile edge cam afiixed thereto adapted for reaction with said die rolls to effect the bending about said rolls.

2. A bending machine of the character described having a stationary gear wheel, a plurality of arcuately spaced die rolls mounted on said stationary gear wheel, a rotatable cam spaced from the center of said stationary gear wheel and adapted for reaction with the die rolls to produce the bending, and a rotatable bull gear means mounted concentrically with the stationary gear wheel and adapted to move the cam bodily in a circular path about the stationary gear wheel.

3. A bending machine according to claim 2, further including an arm fulcrumed about the shaft of the fixed gear wheel and fixed to the rotatable bull gear, the cam being rotatably mounted on the arm.

4. A bending machine according to claim ,2, further including adjusting means for moving the cam along the arm.

5. In a bending machine, a fixed spur wheel having a plurality of arcuately-spaced radially-disposed die rolls mounted thereon together with radially-disposed means for securing thereto one end of a pipe or rod length to be bent, an intermeshing spur gear having a profile cam secured thereto, and means for bodily moving the last mentioned spur wheel planetary-wise about the first mentioned spur wheel to effect, through cooperation of the cam and the rolls, bending of the pipe or rod length to the desired configuration.

6. A bending machine according to claim 5 wherein the second-mentioned spur wheel is mounted on a member rotative about the axis of the first mentioned spur wheel, and further including means for rotating said member about the first-mentioned spur wheel.

7. A bending machine according to claim 5 wherein the second-mentioned spur wheel is mounted upon a bull t 4 gear wheel rotative about the axis of the first-mentioned spur wheel; and further including an intermeshing pinion for driving the bull gear Wheel.

8. A bending machine according to claim 5 wherein the profile cam is of irregular contour with protuberances for depressing the pipe or rod length in the intervals between the die rolls on the first-mentioned spur wheel and for causing the ends of the pipe or rod length to be bent about said rolls.

References Cited in the file of this patent UNITED STATES PATENTS 158,600 Peck Jan. 12, 1875 171,642 Ball Jan. 4, 1876 343,962 Mack June 15, 1886 387,665 Tetlow Aug. 14, 1888 822,445 Hale June 5, 1906 983,664 Wilson Feb. 7, 1911 1,060,461 Klarwasser Apr. 29, 1913 2,430,348 Larsen Nov. 4, 1947 2,501,241 Shaw, Jr Mar. 21, 1950 2,504,782 Allen Apr. 18, 1950 

